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Date: Wed, 22 Apr 2026 08:03:22 +0200
From: Christoph Hellwig <hch@lst.de>
To: Niklas Cassel <cassel@kernel.org>
Cc: Carlos Maiolino <cem@kernel.org>, Christoph Hellwig <hch@lst.de>,
	Damien Le Moal <dlemoal@kernel.org>,
	Hans Holmberg <hans.holmberg@wdc.com>,
	Johannes Thumshirn <johannes.thumshirn@wdc.com>,
	linux-xfs@vger.kernel.org
Subject: Re: [PATCH 1/2] xfs: expose the number of free zones in sysfs
Message-ID: <20260422060322.GC5391@lst.de>
References: <20260420135011.624587-4-cassel@kernel.org> <20260420135011.624587-5-cassel@kernel.org>
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On Mon, Apr 20, 2026 at 03:50:13PM +0200, Niklas Cassel wrote:
> The number of free zones is currently available in /proc/<pid>/mountstats
> (which contains stats for all mounted zoned XFS filesystems), under
> "free zones:".
> 
> Add a sysfs attribute /sys/fs/xfs/<dev>/zoned/nr_free_zones for the same.
> This makes it trivial for monitoring software to read the value, for a
> specific filesystem, without any complex parsing.

The usual way to expose stats in xfs is through the stats sysfs file.
Which requires some parsing, but the usual monitoring tools already
have this.